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Light steel is also a relatively vague term, and generally can have two understandings. One is the eleventh chapter of the current "Code for Design of Steel Structures" (GBJ 17-88) "Light steel structure of round steel and small angle steel", which means round steel and less than L45×4 and L56×36×4. The light steel structure made of angle steel is mainly used for small structures that are not suitable for reinforced concrete structures when the steel is lacking. It has been basically not used, so this steel structure design specification has basically been removed. The other is a single-layer solid belly-type rigid frame structure with a light roof and a light exterior wall (which can also be conditionally used for external walls) as stipulated in the Technical Specification for Steel Structures for Lightweight Houses of Portal Frames. The light weight here mainly means that the enclosure is made of lightweight materials. Since the former one has been canceled quickly, the current light steel meaning mainly refers to the latter. In addition, there are some reference values: such as the cost per square meter, the maximum component weight, the maximum span, the structural form, the high height, etc. These can provide empirical data when judging whether the plant is heavy steel or light steel. Of course, many buildings are now Light and heavy steel are available. National norms and technical documents are not related to heavy steel. In order to distinguish the steel structure of light-duty houses, it may be more appropriate to call the general steel structure “Pugangâ€. Because of the wide range of ordinary steel structures, it can contain a variety of steel structures, regardless of the size of the load, and even the light steel structure, the light steel structure technical regulations only specify some more specific for its "light" characteristics. Content, and the scope is limited to single-story portal frames. It can be seen that the distinction between light steel and heavy steel is not the weight of the structure itself, but the weight of the enclosing material is still consistent with the structural design concept.
"Steel Structure Design Code" GBJ17-88 has been abolished since December 1, 2003. Currently, the "Code for Design of Steel Structures" GB50017-2003 is implemented.
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